Control circuit of multifunctional protection socket

Abstract

The invention discloses a control circuit for a multi-functional protection socket, comprising a signal processing chip IC, a zero sequence current transformer L1, a controllable silicon VS1, a releasing coil L5, a rectifier circuit, a testing circuit, an indicator circuit, a piezoresistor RV1 and other resistor-capacitor unit. The control circuit is characterized in that the control circuit also comprises an over-current transformer L2, a recovery coil L4, a controllable silicon VS2, a short circuit coil L3, a temperature switch ST and a piezoresistor RV2. As the invention has the functions of electric leakage protection, over-load protection, over-heat protection, short circuit protection, over-voltage protection, anti-thunder, etc., the control circuit has wider protection range, and can protect the lives and the possessions of people more effectively and safely.

Description

technical field [0001] The invention relates to a control circuit with multifunctional protection sockets such as overload protection, overvoltage protection, overheat protection, leakage protection, short circuit protection and lightning protection. Background technique [0002] At present, the control circuit of the existing protective socket on the market has the following defects: single function, narrow protection range, large operating current, low sensitivity, and unstable performance. And the overload protection still adopts the bimetal type, the breaking time is greatly affected by the ambient temperature, the breaking delay time is long, and the power supply cannot be disconnected quickly, especially for small household appliances with a rated current below 1A, the defect is more obvious. The action current of the leakage protection is still 30-100mA, which is 10mA greater than the absolute safety current of the human body. Contents of the invention [0003] The...

AI Technical Summary

Problems solved by technology

[0002] At present, the control circuit of the existing protective socket on the market has the following defects: single function, narrow protection range, large operating current, low sensitivity, and unstable performance

And the overload protection still adopts the bimetal sheet type, the breaking time is greatly affected by the ambient temperature, the breaking delay time is long, and the power supply cannot be disconnected quickly, especially for small household appliances with a rated current below 1A, the defect is more obvious

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